• B J Reddy

      Articles written in Pramana – Journal of Physics

    • Spectroscopic studies of transition metal ions in spessartine garnet

      B J Reddy A Sundar Jacob K Janardhanam

      More Details Abstract Fulltext PDF

      From optical absorption studies at room and liquid air temperatures and from Mössbauer spectrum, the absorption bands of spessartine garnet are attributed to Mn2+ and Fe2+ ions. The energy matrices ofd5 andd6 configurations are solved and the experimental data of Mn2+ and Fe2+ bands are fitted with the calculated values to solve for the Racah and crystal field parameters.

    • Optical absorption spectrum of Cr3+ in natural ruby

      B J Reddy L Rama Moorthy

      More Details Abstract Fulltext PDF

      Two sharp line-like bands calledN andR lines on the red side, a close doublet (B lines) on the violet side and two broad bands are observed for natural ruby. At liquid air temperature the splitting ofR line was found and also three sharp-bands calledR, R′ andB lines are identified with spin-forbidden transitions of2E,2T1 and2T2. The two broad bands calledU band andY band are assigned accordingly to the spin-allowed transitions4T2 and4T1 respectively. The observed bands of natural ruby have been attributed to Cr3+ ion in an octahedral environment with trigonal distortion. The crystal field parameters which gave a good fit to the observed band positions areB=732 cm−1,C=4.25B,Dq=1830 cm−1,V=−1996 cm−1 andλ=34 cm−1.

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